Mysterious 444-million-year-old fossil has guts, scientists are losing mind

This new species of ancient arthropod has been affectionately named Sue and scientifically dubbed Keurbos susanae.

Paleontologists have uncovered a 444-million-year-old fossil with remarkably intact soft tissues, such as muscles, tendons, and even digestive organs. Arthropods are a diverse group that includes shrimps, spiders, and insects.Interestingly, Sue was a long paleontological puzzle that took 25 years to unravel. After extensive research, the University of Leicester team has now published their detailed description of a newly discovered multisegmented fossil species.

This period coincided with a major glaciation event that triggered one of Earth’s “big five” mass extinctions – the Ordovician-Silurian extinction event. The devastating glaciation event led to the extinction of nearly 85% of all living organisms.Ancient basin preserved fossil The ancient marine basin where this arthropod lived offered a refuge from a global glaciation event.

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